c - Store 8 Ascii Values in unsigned int -

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i have query. have string of ascii value . reading hex file. consider string "0004eb9c" . copied in unsigned char buffer.

unsigned char buff[8] = {'0','0','0','4','e','b','9','c'} unsigned int j = 0;

now string or information has transmitted through uart communication. consider represents ram address execution. need store 8 byte ascii value in in unsigned int . not finding way can 1 please focus on this. output after copying/converting string should like

printf("%x",j);

this should print 

output : 0x0004eb9c

thanks in advance!!

set answer 0 each character    left-shift answer 4    if character between '0' , '9' inclusive        subtract '0'    else        subtract 'a' , add 10    bitwise-or answer

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