string_substitute  755 src/string.c       return string_substitute(x, SCM_STRING_BODY(x),
string_substitute  769 src/string.c           return string_substitute(x, xb, k, &byte, 1, 1, TRUE);
string_substitute  774 src/string.c           return string_substitute(x, xb, k, buf, size, 1, FALSE);