// *pch is a pointer to the beginning of a string

while (*pch == ' ') pch++;
char * ptemp = pch;
while (*ptemp) ptemp++;
ptemp--;
while (*ptemp == ' ') ptemp--;
*ptemp = 0;

 - or -

while(*ptemp) ptemp++;
do ptemp--;
while(*ptemp == ' ');
*ptemp = '\0'


-- or? --

while (*pch == ' ') pch++;
char * ptemp = pch;
while (*ptemp) ptemp++;
while (*--ptemp == ' ') ptemp--;
*ptemp = '/0';