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#include <stdio.h>
#include <string.h>
int strip(char * txt, char c) {
int len = strlen(txt);
for (int i = len - 1; i >= 0; i--) {
if (txt[i] == c) {
txt[i] = '\0';
} else {
return len - 1 - i;
}
}
return len;
}