Encoding or decoding is based on the keyword input.
Note: Keyword given will be inserted as first in the sequence of alphabet and letters should never repeat.
Example
Keyword: GOD
A=G N=M
B=O O=N
C=D P=P
D=A Q=Q
E=B R=R
F=C S=S
G=E T=T
H=F U=U
I=H V=V
J=I W=W
K=J X=X
L=K Y=Y
M=L Z=Z
Cipher: JMNW = KNOW
