/in/foo.c: In function 'sor':
/in/foo.c:56:6: warning: unused variable 'y' [-Wunused-variable]
  int y;
      ^
/in/foo.c: In function 'main':
/in/foo.c:79:21: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
   parti[i].length = strlen(t);
                     ^~~~~~
/in/foo.c:79:21: warning: incompatible implicit declaration of built-in function 'strlen'
/in/foo.c:79:21: note: include '<string.h>' or provide a declaration of 'strlen'