Review new algorithms

[copyninja]

Hi Santhosh,

Can you review changes done by me to Soundex, and also charmap in silpa_common module nothing much changed but I fixed and improved things and do verify test cases and add any if needed to make sure algorithm works as you designed it before.

[Priyansh2]

@copyninja is this issue resolved ? if no, @copyninja can u send me the improved/updated version ?