Warning(s):

source_file.c: In function ‘main’:
source_file.c:7:9: warning: implicit declaration of function ‘strcpy’ [-Wimplicit-function-declaration]
         strcpy(strc, str);
         ^
source_file.c:7:9: warning: incompatible implicit declaration of built-in function ‘strcpy’
source_file.c:7:9: note: include ‘<string.h>’ or provide a declaration of ‘strcpy’