rwpng.c:242:46: warning: ‘strncmp’ argument 3 type is ‘int’ where ‘unsigned int’ is expected in a call to built-in function declared without prototype [-Wbuiltin-declaration-mismatch] 242 | if(!strncmp("author",comments[c].key,6)){ | ^ <built-in>: note: built-in ‘strncmp...