Language: C

#include<stdio.h>
#include<string.h>

int main(void){
char taps[100];
char word1 =`U`;
char word2 =`D`;
char word3 =`L`;
char word4 =`R`;
int i = 0,a,sum = 0;
scanf("%s",taps);
//何文字目までループを回せばいいかaに代入させる
a = strlen(*taps);

//偶数番目にlが出た回数と奇数番目にrが出た時にカウントして合計が０なら踏みやすいタップ
//taps[0]が1番目に来る
for(i=0;i<=a;i++){
 if(strcmp(taps[i],word3) == 0){
  sum = sum + 1;
  i++;
    }
  }
//taps[１]が2番目に来る
  for(i=1;i<=a;i++){
 if(strcmp(taps[i],word4) == 0){
  sum = sum + 1;
  i++;
    }
  }  
　
if (sum == 0){
     printf("Yes");
 } 
else {
      printf("No"); 
 }
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:13: error: stray '`' in program
    6 | char word1 =`U`;
      |             ^
main.c:6:15: error: stray '`' in program
    6 | char word1 =`U`;
      |               ^
main.c:6:14: error: 'U' undeclared (first use in this function)
    6 | char word1 =`U`;
      |              ^
main.c:6:14: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:13: error: stray '`' in program
    7 | char word2 =`D`;
      |             ^
main.c:7:15: error: stray '`' in program
    7 | char word2 =`D`;
      |               ^
main.c:7:14: error: 'D' undeclared (first use in this function)
    7 | char word2 =`D`;
      |              ^
main.c:8:13: error: stray '`' in program
    8 | char word3 =`L`;
      |             ^
main.c:8:15: error: stray '`' in program
    8 | char word3 =`L`;
      |               ^
main.c:8:14: error: 'L' undeclared (first use in this function)
    8 | char word3 =`L`;
      |              ^
main.c:9:13: error: stray '`' in program
    9 | char word4 =`R`;
      |             ^
main.c:9:15: error: stray '`' in program
    9 | char word4 =`R`;
      |               ^
main.c:9:14: error: 'R' undeclared (first use in this function)
    9 | char word4 =`R`;
      |              ^
main.c:13:12: error: passing argument 1 of 'strlen' makes pointer from integer without a cast [-Wint-conversion]
   13 | a = strlen(*taps);
      |            ^~~~~
      |            |
      |            char
In file included from main.c:2:
/usr/include/string.h:407:35: note: expected 'const char *' but argument is of type 'char'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
main.c:18:16: error: passing argument 1 of 'strcmp' makes pointer from integer without a cast [-Wint-conversion]
   18 |  if(strcmp(taps[i],word3) == 0){
      |            ~~~~^~~
      |                |
      |                char
/usr/include/string.h:156:32: note: expected 'const char *' but argument is of type 'char'
  156 | extern int strcmp (const char *__s1, const char *__s2)
      |                    ~~~~~~~~~~~~^~~~
main.c:18:20: error: passing argument 2 of 'strcmp' makes pointer from integer without a cast [-Wint-conversion]
   18 |  if(strcmp(taps[i],word3) == 0){
      |                    ^~~~~
      |                    |
      |                    char
/usr/include/string.h:156:50: note: expected 'const char *' but argument is of type 'char'
  156 | extern int strcmp (const char *__s1, const char *__s2)
      |                                      ~~~~~~~~~~~~^~~~
main.c:25:16: error: passing argument 1 of 'strcmp' makes pointer from integer without a cast [-Wint-conversion]
   25 |  if(strcmp(taps[i],word4) == 0){
      |            ~~~~^~~
      |                |
      |                char
/usr/include/string.h:156:32: note: expected 'const char *' but argument is of type 'char'
  156 | extern int strcmp (const char *__s1, const char *__s2)
      |                    ~~~~~~~~~~~~^~~~
main.c:25:20: error: passing argument 2 of 'strcmp' makes pointer from integer without a cast [-Wint-conversion]
   25 |  if(strcmp(taps[i],word4) == 0){
      |                    ^~~~~
      |                    |
      |                    char
/usr/include/string.h:156:50: note: expected 'const char *' but argument is of type 'char'
  156 | extern int strcmp (const char *__s1, const char *__s2)
      |                                      ~~~~~~~~~~~~^~~~
main.c:30:1: error: stray '\343' in program
   30 | <U+3000>
      | ^~~~~~~~