Question

How can we route the corruption

Answer 1

There are basically two types of “corruption”:

Brown-envelope corruption
Cronyism.
Brown-envelope corruption is when someone - a cop, a judge, a politician - accepts small amounts (hence, brown envelope) in exchange for small favors. Usually this money is spent on personal consumption. It happens because the corrupt officials evaluate the likelihood of getting caught and the punishment as being too small. Mitigating factors include:

increase the punishment
mandatory jail sentence
fines higher than the amount received
forfeiture of all goods bough without plausible legitimate income, regardless if it was bought for, or transferred to, third parties.
increase the likelihood of catching crooks, by means such as:
mandatory asset and income statement audit for officials;
unassailable freedom of speech, especially for media;
protection of witnesses, collaborators and turncoats;
no prescription period for corruption crimes;
quick and speedy trials;
police investigation;
investigation of the police;
investigation of the officials that investigate the police;
investigation of the officials that investigate the officials that investigate the police;
investigation of the officials that investigate the officials that investigate the officials that investigate the police, and so on, recursively…