Add header guard to yla_type
Add return type to extern declaration in ADD_TEST macro
Add lost return 0 to some test methods
Fix grammar
Get rid of including unused header
Remove unused variable
Get rid of including unused header
Fix types used for storing stack's elements
Change type for size method to size_t
Remove unused variable
Fix type incompatibility
Fix array filling size
Merge branch 'feature/fix-warnings' into develop