Database
[{"_id":3,"name":" Shyam Lingam "}]
Query
db.collection.find({_id:3},{name:{$trim:{input:{$reduce:{input:{$filter:{input:{$split:["$name"," "]},cond:{$ne:["$$this",""]}}},initialValue:"",in:{$concat:["$$value"," ","$$this"]}}}}}})