How can we help a young Muslim who is under the influence of bad friends ?
The most important and effective thing to do for this subject is to move away him/her from the environment in which he/she stands in and provide him/her a religious community house (a dormitory like place where students come from abroad and study there while they are not separated from their religious duties such as fasting, praying). Mud definitely splashes to a person who is in a swamp. You should take him/her from that swampy environment and settle him/her in a place where there are decent people. Such an environment must be provided for him/her.