[bug] Target name collides when building each crate simultaenously

[Unique-Divine]

Context

When running cargo build at the root of the project:

... filename as the example target schema in package core-token-vesting-v2 v2.1.0 (/home/ud/ki/cw-nibiru/contracts/core-token-vesting-v2).
Colliding filename is: /home/ud/ki/cw-nibiru/target/debug/examples/schema.dwp
The targets should have unique names. 
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see https://github.com/rust-lang/cargo/issues/6313

• Duplicate artifact tracking issue. rust-lang/cargo#6313