added Kruskal's algorithm, with runtime errors
added *.bin to .gitignore
deleted accidentally uploaded graph_algorithms.bin
change edge representation to struct edge
implemented Dijkstra's algorithm
corrected runtime errors caused at free()
implemented Bellman-Ford algorithm
implemented floyd-warshall algorithm
added binary heap implementation
heap insertion now works correctly
added license
added implementation of simple lexical analyzer
added parser implementation
optimized transitions in lexical analysis